Clamp.



PATENTED JUNE 19, 1906.

F. B. WALDEN.

CLAMP. APPLICATION FILED AUG. 26. 1905.

FrederiqYcE. 7517070 J I I'Ibb TED :ST E PATENT FFIOE...

FREDERICK E. WALDE oFwOROEST ER, MASSACHUSETTS, ASSIGNOR To BAY STATETOOL COMPANY, OF BOSTON, MASSAOHUSETT A CORPO- RATION OF MAINE.

CLAMP.

Specification of Letters fatent.

Patented June 19, 1906.

Applicationflld August 26, I905." $erial 1l'o.l275,879. V I i in Clamps,of which the following is a full,

clear, and exact description.

The object ,of this invention is the construction of an improved clampwherein the clampscrew can be quickly adjusted from one extreme to theother by a sliding movement and then turned to give the clamping action.

Referring to the drawings forming part of this specification, Figure 1is a sideview of a C-clamp having my improvements applied thereto. Fig.2 is a sectional view on the line X X in Fig. 1. Fig. 3 is a peripheralview of the release-nut, and Fig. 4 is an end view of the same.

The C-clamp l is formed with the usual arm for holdng the clamping-screwand the clamping-arm 3. The screw is of the usual character, beingprovided with suitable means for itszoperation, as the thumb head 16.The novelty consists in the arrangement by means of which said screw canbe quickly shifted from one point to another. This is as follows: At theend of the arm 2 and integral therewith are abutments 4 and 5, betweenwhich is located the nut 20, within which said screw can be turned forits longitudinal adjustment. The internally-threaded opening 21, throughwhich said screw passes, is made sufficiently large to permit the screwto freely slide longitudinally therein without contact when the axialcenters of both are in alinement. The exterior of Said nut is eccentricwith said opening 21-, as shown in Fig. 4, and fits within the flanges 6and 7, formed on the said abutments 4 and 5. As the screw 1 5 slides inthe unthreaded holes 9, made in said abutments concentric with saidflanges, a partial turn of said nut will either wedge the threads formedwithinthe opening 21 into mesh with the said screw or move the same outof mesh. Said nut is formed with means for its easy rotation, preferablythree radial projections 22, arranged to receive the thumb of theoperator between two neighboring projections. I prefer to locate theprojections 22 in such relation to the other parts of the device thatwhen thenut 20 is turned to move its threads out of mesh with the screwone of said projections will meet one edge of the arm 2, while theopposite projection will meet the other edge of said arm when the nut isturned to hold said threads in mesh. To insure that the nut will not bedislodged from either of said positions, I provide the locking deviceconsisting of the small pointed plunger 10, located in a hole drilleddown into the arm 2 midway between the abutments 4 and 5, as shown inFigs. 1 and 2, and pressed by a coiled spring 11 into a small depression23 in the periphery of said nut at each end of its turn.

The flanges 6 and 7 must be cut away for a semicircumference, as shownin Figs. 1 and 2, to permit of the introduction of the nut 20 within theabutments. To prevent its dropping out when the clamping-screw isaccidentally or intentionally wholly withdrawn, I drive a small pin 8through the abutment 5 in a hole provided therefor after the nut hasbeen put in place. This pin is located not to interfere with therotation of the nut, but to prevent its removal, and I prefer toposition this pin close beneath the overhan ing extremity of the flange7, as shown, in order that its presence shall not be visible to suchevil-disposed workmen or loafers as might be Otherwise minded to driveout such pin and abstract the screw, the entire clamp being too bulky tobe easily secreted and stolen. In using this clamp the nut is moved toone extreme to release the'clamping-screw, the latter is slid to thepoint desired, the nut swung back to bring it into mesh with the screw,and the thumb-piece 16 turned until the screw is forcibly clamping thework between its extremity and the clamp-arm 3.

What I claim as my invention, and'for which I desire Letters Patent, isas follows, to wit:

1. The combination with a clamping Inember having centrally aperturedseparated abutments, of a screw slidable therein, a cylindricaleccentric nut having its opening threaded to correspond with said screwbut larger in diameter, and located between said abutments,semiperipheral flanges formed on said abutments and partially embracingsaid nut, and a locking-pin inserted at the termination of one of saidflanges to prevent the withdrawal of said nut.

2. The combination with a clamping member having centrally aperturedseparated I depressions to partially receive said plunger,

abutments, of a screw slidable therein, a cylindrical eccentric nuthaving its opening threaded to correspond with said screw but 5 largerin diameter, and located between said abutments, semiperipheral flangesformed on said abutments fitted to said nut, a lock ing-pin to preventthe withdrawal of said nut, and a pointed plunger resiliently pressed 10against said nut the latter being formed with and the nut being providedwith projections for its easy rotation.

In testimony that I claim the foregoing in vention I have hereunto setmy hand this I 5 19th day of Au ust, 1905.

FREDERICK E. WALDEN.

Witnesses:

A. B. UPHAM, F. TUDOR.

